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Adaptive Neural Network Control of a 2-DOF Helicopter System with Input Saturation
Jian Zhang,Zhijia Zhao,Yubao Yang,홍금식 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.1
This paper investigates an adaptive neural network control strategy for a two-degree-of-freedom helicopter system with input saturation and unknown external disturbances. Firstly, the radial basis function neural network is used to compensate the uncertainty and input saturation error of the system. Furthermore, a disturbance observer is designed to deal with complex disturbances composed of unknown disturbances and neural network errors. By constructing and analyzing the Lyapunov function, the stability of the helicopter system is strictly guaranteed. Finally, the numerical simulations and experiments conducted on the Quanser laboratory platform reveal that the proposed control strategy is suitable and effective.
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Razi, Syed S.,Koo, Yun Hee,Kim, Woojae,Yang, Wenbo,Wang, Zhijia,Gobeze, Habtom,D’Souza, Francis,Zhao, Jianzhang,Kim, Dongho American Chemical Society 2018 Inorganic Chemistry Vol.57 No.9
<P>A boron dipyrromethane (BDP)-containing Pt(II)-Schiff base complex (<B>Pt-BDP</B>), showing ping-pong singlet-triplet energy transfer, was synthesized, and the detailed photophysical properties were investigated using various steady-state and time-resolved transient spectroscopies. Femtosecond/nanosecond transient absorption spectroscopies demonstrated that, upon selective excitation of the BDP unit in <B>Pt-BDP</B> at 490 nm, Förster resonance energy transfer from the BDP unit to the Pt(II) coordination center occurred (6.7 ps), accompanied by an ultrafast intersystem crossing at the Pt(II) coordination center (<1 ps) and triplet-triplet energy transfer back to the BDP moiety (148 ps). These processes generated a triplet state localized at BDP, and the lifetime was 103.2 μs, much longer than the triplet-state lifetime of <B>Pt-Ph</B> (3.5 μs), a complex without the BDP moiety. Finally, <B>Pt-BDP</B> was used as a triplet photosensitizer for triplet-triplet annihilation (TTA) upconversion through selective excitation of the BDP unit or the Pt(II) coordination center at lower excitation energy. An upconversion quantum yield of up to 10% was observed with selective excitation of the BDP moiety, and a large anti-Stokes shift of 0.65 eV was observed upon excitation of the lower-energy band of the Pt(II) coordination center. We propose that using triplet photosensitizers with the ping-pong energy-transfer process may become a useful method for increasing the anti-Stokes shift of TTA upconversion.</P><P>BDP was attached on the Pt(II)−Schiff base framework. Forward singlet energy transfer (6.7 ps) occurs from BDP to the Pt(II) coordination center, followed by backward triplet energy transfer (148 ps). The T<SUB>1</SUB> state is on BDP (103.2 μs; parent complex, 3.5 μs). The anti-Stokes shift of triplet−triplet annihilation (TTA) upconversion increased to 5290 cm<SUP>−1</SUP> with excitation into the BDP moiety compared to direct excitation into the Pt(II) center (2660 cm<SUP>−1</SUP>). The TTA upconversion quantum yield is up to 10%.</P> [FIG OMISSION]</BR>
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